Raw Data Inversion
This inversion approach uses the raw multichannel field record as it is without any further processing such as dispersion imaging (Forbriger, 2003b) (Fig. 1). This basically
tries to compare the whole seismic waveforms observed at different distances from the source with synthetic waveforms generated from a proper forward modeling scheme.
This approach may have the advantage of eliminating bias caused by subsequent data processing such as dispersion imaging or curve extraction. It, however, has to
simultaneously solve the difficulty of handling the attenuation and excitability issues, as well as layer parameters, as all of these can contribute to the shaping of a seismic